Get a half link from the 1610/930 bracelet as fitted to the 2254 and 2255. This uses the same links as the Speedmaster 1998 bracelet but has in addition an available half link. About £20 from a Omega boutique, considerably more from Cousins, eBay etc
edit: on second glance, that looks like the screw link bracelet you have so maybe my suggestion won’t work.